Her research interests are environmental microbiology and food microbiology. Research on environmental microbiology is focused on the bioremediation of wastewater (leachate) by means of enzymes produced by fungi and also the used of agriculture wastes as the growth medium of fungi. Food microbiology research includes the detection of bacteria pathogen (contamination) in food samples. Sponsors of Wan Razarinah’s research include the Science Fund (Ministry of Science and Innovation of Malaysia (MOSTI) and Fundamental Research Grant Scheme (FRGS).